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Lateral Ankle Instability

Custom Pathology Specific Orthoses

Definition

Lateral ankle instability originates from a hypermobile and unstable ankle with a history of lateral ankle ligament disruption. This instability leaves the ankle susceptible to further injury.

Overview

Numerous studies have shown that foot orthoses play a significant role in the treatment of lateral ankle instability, although the exact mechanism of their function is debated. This pathology specific orthosis is appropriate for the patient who has ankle instability that produces excessive supination of the foot. This can be a complicated orthotic prescription due to the large variety of foot types that demonstrate this problem.

Clinical Goal for Orthotic Treatment

The goal of an orthosis for lateral ankle instability is to resist excessive supination by applying a pronatory force to the foot.

"No lateral bevel" increases the rearfoot post contact area with the ground to increase orthotic stability

Valgus Extension

Increases pronatory torque under the metatarsal heads in order to reduce supinatory torque and can lead to lateral ankle instability

Summary

This orthosis is designed to reduce excessive supinatory forces that can lead to lateral ankle instability. If excessive supination is not the mechanism of the lateral instability, do not use these prescription recommendations. ProLab clients are encouraged to discuss any questions with a Medical Consultant.